Memory exhausted when doing a case-insensitive match to an empty regexp

[Tony Leneis]

        Gawk has started having problems with case-insensitive empty
regexp matches sometime between version 3.1.1 and 3.1.4.  Here's what I
see with gawk 3.1.4 and 3.1.5:

# gawk 'BEGIN { IGNORECASE=0; print "test" ~ "" }'
1
# gawk 'BEGIN { IGNORECASE=1; print "test" ~ "" }'
gawk: fatal: memory exhausted

When I try the same program under gawk 3.0.3, 3.1.0, and 3.1.1 I get a
response of 1 regardless of how IGNORECASE is set.

-Tony

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